Gigantic thanks to Kolokol, for that he translated HunCraft Genocide into English in 2019.
1. You need StarCraft and Brood War, which can be downloaded from here (they are free since StarCraft remastered was released):
2. You need to install HunCraft Genocide Hungarian version, which can be downloaded here:
or here:
After that, download the files from THIS package, unzip them and overwrite the Hungarian version in your StarCraft installation directory.
See more detailed instructions here: